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Search for dark matter produced in association with a single top quark in √s=13 TeV pp collisions with the ATLAS detector
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Search for dark matter produced in association with a single top quark in √s=13 TeV pp collisions with the ATLAS detector

G. Aad, B. Abbott, D.C. Abbott, A. Abed Abud, K. Abeling, D.K. Abhayasinghe, S.H. Abidi, O.S. AbouZeid, N.L. Abraham, H. Abramowicz, …
European Physical Journal C, 卷.81(10), 860
10/2021

摘要

Engineering (miscellaneous) Physics and Astronomy (miscellaneous)
This paper presents a search for dark matter in the context of a two-Higgs-doublet model together with an additional pseudoscalar mediator, a, which decays into the dark-matter particles. Processes where the pseudoscalar mediator is produced in association with a single top quark in the 2HDM+a model are explored for the first time at the LHC. Several final states which include either one or two charged leptons (electrons or muons) and a significant amount of missing transverse momentum are considered. The analysis is based on proton–proton collision data collected with the ATLAS experiment at s=13 TeV during LHC Run 2 (2015–2018), corresponding to an integrated luminosity of 139 fb - 1 . No significant excess above the Standard Model predictions is found. The results are expressed as 95% confidence-level limits on the parameters of the signal models considered.

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https://doi.org/10.1140/epjc/s10052-021-09566-y檢視
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